Data interfaces

ABSTRACT

A computer-implemented system for accessing data stored in a computer-readable format comprises a data source indicator that identifies least one datum of a data source to be typed. The system also includes a type definition component that defines a strongly typed view of the at least one datum. Methods of using the system are also provided.

BACKGROUND

Computing systems increasingly must work with data from diverse sources.Often the data with which these systems must work is in a variety ofdifferent formats and representations. Although a large number offormats and representations exist, several major ways of representingdata have evolved and become prevalent in modern computing environments.Each of these formats and representations has its own strengths andweaknesses. Choice among formats is a common problem encountered bysoftware developers.

The relational data model makes it easy to query large amounts ofinformation. However, this model does not allow for data that resultsfrom a query to be encapsulated. Additionally, relational data is notdesigned for transmission across the wire. The extensible markuplanguage (XML) model of data representation makes it easy to transmitinformation across the wire, but is not designed to be encapsulated andis difficult to query. The object model of data is designed aroundencapsulation principles, but cannot be easily transmitted across thewire. Further, the object model usually offers no effective querycapabilities. No single data model provides everything in one package.Most computing applications require using at least two, if not allthree, data representation models.

Because each model by definition has a different way of representingdata, when the format of represented data is converted from one model toanother, a mapping between models usually must be created. Mostprogramming languages do not provide a standard way to specify themapping between the object model and either the relational or the XMLmodel. Instead, each mapping system usually defines its own set ofattributes or schema language to specify how data should map betweenacross the models.

Most programming languages also require, as part of the mapping, thatthe data be copied. Usually, when data is mapped from either the XML orrelational model onto the object model, the data is transformed from theXML or relational representation into an object. As a result, the datais disconnected from its original representation because it has beenfully encapsulated in an object. To preserve a connection between theobject representation and the original representation, the encapsulatingobject must either include additional information that maintains theconnection or an external component must track the connection betweenthe object and its original data. Either approach means that thecomputer programmer or software developer is usually limited in howobject representations are defined or the computer programmer orsoftware developer must explicitly manage the relationship between theobject representation and the original representation.

Copying data as part of a mapping also has performance implications.When working with large amounts of information, the requirement thatdata be shuttled back and forth from one representation to another ismemory intensive, both in terms of object allocations and in terms ofthe basic amount of copying required. Current systems fail to provide anefficient way for data to be used across representation paradigms.

SUMMARY

The following presents a simplified summary in order to provide a basicunderstanding and high-level survey. This summary is not an extensiveoverview. It is neither intended to identify key or critical elementsnor to delineate scope. The sole purpose of this summary is to presentsome concepts in a simplified form as a prelude to the more detaileddescription later presented. Additionally, section headings used hereinare provided merely for convenience and should not be taken as limitingin any way.

A data interface provides a means to impose a strongly-typed view overuntyped data. The data interface has a static type that can be erasedduring compilation procedures. Use of a data interface permitstypecasting of data by declaring a first object in terms of a secondobject. Members of such an interface can be constrained with respect totheir attributes such a default implementation can be assured.

A generic data interface can be imposed over data of arbitrary types byadding each of the arbitrary types to the generic interface. For anarbitrary type to be added, the type must implement a fixed, special, orreflection interface. When adding a type, a conversion from the genericinterface to the type in terms of the fixed, special, or reflectioninterface that the type implements is provided. A user-defined interfacecan be used in place of either or both of the generic interface or thefixed, special, or reflection interface.

The disclosed and described components and methods comprise one or moreof the features hereinafter described and particularly pointed out inthe claims. The following description and the annexed drawings set forthin detail certain specific illustrative components and methods. However,these components and methods are indicative of but a few of the variousways in which the disclosed components and methods can be employed.Specific implementations of the disclosed and described components andmethods can include some, many, or all of such components and methods,as well as their equivalents. Variations of the specific implementationsand examples presented herein will become apparent from the followingdetailed description when considered in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a system block diagram of a data interface system.

FIG. 2 is a system block diagram of a data interface system.

FIG. 3 is a system block diagram of a data interface system.

FIG. 4 is a system block diagram of a composable data interface system.

FIG. 5 is a system block diagram of a software development system.

FIG. 6 is a flow diagram depicting a general processing flow of a methodthat can be employed in accordance with components that are disclosedand described herein.

FIG. 7 is a flow diagram depicting a general processing flow of a methodthat can be employed in accordance with components that are disclosedand described herein.

FIG. 8 is a flow diagram depicting a general processing flow of a methodthat can be employed in accordance with components that are disclosedand described herein.

FIG. 9 is a flow diagram depicting a general processing flow of a methodthat can be employed in accordance with components that are disclosedand described herein.

FIG. 10 is a flow diagram depicting a general processing flow of amethod that can be employed in accordance with components that aredisclosed and described herein.

FIG. 11 is a flow diagram depicting a general processing flow of amethod that can be employed in accordance with components that aredisclosed and described herein.

FIG. 12 illustrates an exemplary computing environment.

FIG. 13 illustrates an exemplary networking environment.

DETAILED DESCRIPTION

As used in this application, the terms “component,” “system,” “module,”and the like are intended to refer to a computer-related entity, such ashardware, software (for instance, in execution), and/or firmware. Forexample, a component can be a process running on a processor, aprocessor, an object, an executable, a program, and/or a computer. Also,both an application running on a server and the server can becomponents. One or more components can reside within a process and acomponent can be localized on one computer and/or distributed betweentwo or more computers.

Disclosed components and methods are described with reference to thedrawings, wherein like reference numerals are used to refer to likeelements throughout. In the following description, for purposes ofexplanation, numerous specific details are set forth in order to providea thorough understanding of the disclosed subject matter. It may beevident, however, that certain of these specific details can be omittedor combined with others in a specific implementation. In otherinstances, certain structures and devices are shown in block diagramform in order to facilitate description. Additionally, although specificexamples set forth may use terminology that is consistent withclient/server architectures or may even be examples of client/serverimplementations, skilled artisans will appreciate that the roles ofclient and server may be reversed, that the disclosed and describedcomponents and methods are not limited to client/server architecturesand may be readily adapted for use in other architectures, specificallyincluding peer-to-peer (P2P) architectures, without departing from thespirit or scope of the disclosed and described components and methods.Further, it should be noted that although specific examples presentedherein include or reference specific components, an implementation ofthe components and methods disclosed and described herein is notnecessarily limited to those specific components and can be employed inother contexts as well.

It should also be appreciated that although specific examples presentedmay describe or depict systems or methods that are based upon componentsof personal computers, the use of components and methods disclosed anddescribed herein is not limited to that domain. For example, thedisclosed and described components and methods can be used in adistributed or network computing environment. Additionally oralternatively, the disclosed and described components and methods can beused on a single server accessed by multiple clients. Those of ordinaryskill in the art will readily recognize that the disclosed and describedcomponents and methods can be used to create other components andexecute other methods on a wide variety of computing devices.

FIG. 1 is a system block diagram of a data interface system 100. Thedata interface system 100 can be used to provide a strongly typed viewof untyped data. Specifically, the data interface system 100 can be usedto supply types for data in a well-formed XML document, or an objectwhose static type is unknown.

It should be noted that in examples presented with reference to thisparticular figure, as well as other figures throughout this document,code segments are used to further illustrate principles or conceptspresented herein. Such code segments may resemble, or even be, XML codeor source code written in pseudocode or a high-level programminglanguage. Such examples are not intended to, and do not, imply that thesystems, components, methods, principles, or concepts disclosed anddescribed herein are limited to specifics of these examples. Those ofordinary skill in the art will recognize from reading this disclosurethat other implementations, some of which can require some modificationsthat are within the ability of an ordinary skilled artisan, are possibleand that the systems, components, methods, principles, or conceptsdisclosed and described herein have broad applicability.

The data interface system 100 includes a data interface 110. The datainterface 110 can be a generic interface that can be created by acomputer programmer or software engineer. The data interface 110 canalso include one or more members 120. In an object-orientedimplementation, a member can include a property, a method, or an object,among other things. In some specific examples, such as when a guaranteedimplementation for a specific data interface 110 is desired, members canbe restricted, such as only allowing properties as members of the datainterface 110.

A fixed interface 130 is also part of the data interface system 100. Thefixed interface 130 can be part of a high-level programming language, ora compiler for a high-level programming language, as necessary orappropriate depending upon context. The fixed interface 130 can be aninterface that is implemented by some data type. For example, a datatype that represents an XML element can be called XElement. The XElementtype can implement a fixed interface for using data called ITuple. Thedata interface can be called IPoint. The XElement type can obtaininformation from an XML document that defines an element as some contentnested between and opening text tag, such as <tag>, and a closing texttag, such as </tag>. In this example, and others building from orotherwise related to this example, the IPoint data interface can be usedto work with information that describes a point in a Cartesiancoordinate system, specifically in an x, y plane.

The data interface 110 can be used to supply a static type for data tobe accessed. Specifically, the static type of the data interface 110 canbe used when the dynamic interface 110 is imposed over some untypeddatum. An implementation generation component 140 can use informationabout the data interface 110 and members 120 of the data interface 110,along with information about the fixed interface 130, to strongly typean underlying datum. One possible way of strongly typing the underlyingdatum is by taking an object that was declared in terms of the datainterface 110 and using a conversion supplied by a member 120 of thedata interface 110 to view the object in terms of the fixed interface130.

The implementation generation component 140 can be a compiler for ahigh-level programming language or other programming language, apreprocessor, a precompiler, or some other appropriate or suitablecomponent. Operation of the implementation generation component canresult in the creation of an implementation 150. The implementation 150can be a strongly-typed view of the originally untyped data.

The following exemplary code segments and associated discussion canfurther illustrate these concepts. Begin by taking the followingXML-style (later referred-to for brevity and readability simply as XML)code: <Point>   <X> 5 </X>   <Y> 7 </Y> </Point>

This XML code can define a point in the previously described Cartesiancoordinate system. To create an XML element in a high-level programminglanguage, the following can be used: Dim P As XElement = <Point>   <X> 5</X>   <Y> 7 </Y> </Point>

This exemplary code can create an XElement object, P, that includesinformation from the original XML code. It should be noted that in thisand other examples, late binding can be used. In such case, the codeabove can be written as: Dim P = <Point>   <X> 5 </X>   <Y> 7 </Y></Point>To access the value 5 from the X element, the following programming codecan be used:DimX=P.XIn this code, the X child is selected as an XElement but does not havean assigned data type that can be tracked or manipulated. Because thisexemplary code defines a point, the values of x and Y, 5 and 7respectively, should be accessed as integers. These values can thus beviewed as having a type instead of simply as a fragment of XML code.

To view these values as having a type, a data interface, such as thedata interface 130, can be defined. The following code shows anexemplary definition: Data Interface IPoint   Property X As Integer  Property Y As Integer End Interface

In this example, untyped data, the values 5 and 7 from the underlyingXML code, is the starting or reference point. The data interface IPointcan define a contract or provide a type accessor that can be used tocast the untyped data to a specified type. Specifically, the IPoint datainterface can be imposed as a view over the type to which the data hasbeen cast. The members of the IPoint data interface, specifically thetwo Property members, provide explicit casts for values of both the Xand Y elements from the XML code to type Integer. The data interfaceIPoint provides the translation from an XML fragment. In this case, afragment can be some datum that is described by enclosing tags. Theenclosing tags can include other enclosing tags. The data interfacedefinition can provide an identification of an XML element property anda type to which a datum of the identified XML property is to be cast.

Consider the following exemplary code: Dim Q As IPoint = P  // P hastype // XElement here. Dim X2 As Integer = Q.X

This code can create X2 of type Integer which receives its value from anIPoint object Q that itself received a value from an untyped XElement.At compile time, data interface types, such as the IPoint type, can beerased. Following erasure procedures, only a static type will remain. Inthis instance, a conversion occurs from XElement to IPoint.

Erasure can be used to eliminate the static IPoint type. Only a compilerfor the high level programming language will have information thatobject Q is declared as an IPoint object. To other components, object Qis seen as an XElement. The IPoint type is merely a means to impose thetyped view.

Consider the following exemplary code: Dim R As Integer( ) = {5, 7} DimS As IPoint = R /*Assume conversion from Integer( )to Ipoint*/ Dim X3 AsInteger = S.X Dim U As DataRow = new DataRow (“X”, “Y”, 5, 7) Dim V AsIPoint = U /*Assume conversion from DataRow( ) to IPoint*/ Dim X4 AsInteger = U.X

Here, three different types are present. The view enabled by the datainterface 130, such as the exemplary IPoint interface, can be imposedover all three types. A universal representation, DataRow, is untyped.For each of the three types presented, examine how the property isimplemented. If an XElement is provided, to implement X, select thechild, obtain the value of the child, and convert the obtained value totype Integer. For an array such as R that was created as Integer( ), toimplement X, select the zero-th element of the array, obtain the valuestored at that position of the array, and convert the obtained value totype Integer. To implement the DataRow, select the column named “x”, getthe value stored at that column position, and convert that value to typeInteger.

To be able to implement this data interface with differing specificimplementations so that the interface can be imposed over multipletypes, it is possible to use an interface that the types alreadycommonly implement. Once such an interface is identified, a genericinterface can be defined in terms of that common fixed interface. Acommon interface that can be identified for these examples is ITuple.Additional types can be added to the generic interface so long as thetype to be added implements the common interface ITuple. IPoint can bedefined in terms of ITuple. Any type added to the generic interface thatimplements the common fixed interface can be defined in terms of thefixed interface.

In the exemplary implementation scheme described, the number ofinterfaces needed to be implemented can be managed so that a finitenumber of implementations is needed. Each of the lower types needs toimplement an interface and the generic interface upper type needs to beable to call the implemented interface. An implementation can alsospecify that there is no inheritance relation from a generic interfaceto a fixed interface that is implemented by one of the lower types. Forexample, an implementation can specify that there is no inheritance fromIPoint to ITuple. This inheritance limitation can be removed if desiredin a particular implementation.

Any type that implements ITuple can be viewed as an instance of IPoint.Conversion code for the types can inserted by the compiler. The staticIPoint type is erased. The remaining dynamic type was expressed in termsof the erased static type. The static type IPoint exists at compile timeas a capsule for the conversion code. This conversion code is pastedinto the generated code by the compiler. The static type disappears. Inthe sense of the language and the underlying machine, base types mustimplement a common interface. Data interfaces such as the ones describedexist as constructs for a compiler. Implementations of members of thedata interface are expressed in terms of members of a fixed interface.

In another possible implementation, a compiler can examine a type and aname and use that information to derive from a signature how to deriveone property in terms of another property. An expressed-inimplementation can be implicit from signatures of members in datainterfaces. The implementation generation component 150, whenconstructed as a compiler, can use signatures to find matchingexpressions for derivations such as the ones previously disclosed anddescribed herein.

When imposing in interface view over multiple types, the types overwhich the interface view is imposed must implement a common or specialinterface. In these examples, that interface is ITuple. Objects can beexpressed in terms of ITuple. An object of some type implements a fixedinterface. Implementation of the fixed interface is also fixed. In thismanner, degrees of freedom can be limited when imposing an arbitraryview on an arbitrary type.

A fixed interface can be a reflection interface. This reflectioninterface can provide the ability to reflect over a type. Normally,reflection is a function that is part of a runtime environment.Providing a reflection interface allows a type to implement its ownreflection. A fixed reflection-type interface can provide the ability toinspect a type. When a type implements this interface to obtainintrospection of type and value, members of these data interfaces cab berestricted to have only properties to provide the case that a defaultimplementation will be available. In the foregoing examples, whenerasure occurs such erasure is to ITuple. With this scheme, thecompiler, such as the implementation generation component 150, has a wayat runtime to inspect types.

A default implementation can be obtained by following a pre-establishedprocedure. First, a reflection interface can be used to get a memberwith a name specified by a signature. Next, a return type can be used tocast the result. A specified interface can be used to get a member witha specified name and a specified type from a signature to cast a result.In terms of the foregoing examples, the first-layer ITuple interface caninform how to access properties in a generic manner. The second-layergeneric interface informs how to get strongly typed information fromITuple.

In this specific scheme, an early-bound layer is placed over alate-bound layer. This specific implementation can provide support forother or ancillary features such as additional type checking andintelligent code-creation functions. Such intelligent code-creationfunctions can be implemented with the assistance of artificialintelligence components such as expert systems, neural networks,rules-based processing components, or support vector machines (SVMs),among others. Specifically, an intelligent code-creation component canuse classifiers to suggest code completions, can suggest typecasting, orcan perform other useful functions.

A classifier is a function that maps an input attribute vector, X=(x1,x2, x3, x4, . . . xn), to a confidence that the input belongs to aclass, that is, f(X)=confidence(class). Such a classification can employa probabilistic and/or statistical-based analysis (for example,factoring into the analysis utilities and costs) to prognose or infer anaction that a user desires to be automatically performed. In the case ofan end-user programming module, patterns of events can be classified todetermine whether to take one or more specified actions. Otherpatter-matching tasks can also be employed as will be evident to anartisan of ordinary skill upon reading this disclosure.

An SVM is an example of a classifier that can be employed. The SVMoperates by finding a hypersurface in the space of possible inputs,which hypersurface attempts to split the triggering criteria from thenon-triggering events. Intuitively, this makes the classificationcorrect for testing data that is near, but not identical to trainingdata. Other directed and undirected model classification approachesinclude, for example, naïve Bayes, Bayesian networks, decision trees,and probabilistic classification models providing different patterns ofindependence can be employed. Classification as used herein alsoincludes statistical regression that is utilized to develop models ofpriority.

As will be readily appreciated from the subject specification,components disclosed or described herein can employ classifiers that areexplicitly trained (for example, by a generic training data) as well asimplicitly trained (for example, by observing user behavior, receivingextrinsic information). For example, SVMs are configured by a learningor training phase within a classifier constructor and feature selectionmodule. Thus, the classifier(s) can be used to automatically perform anumber of functions including but not limited to making codingsuggestions or identifying coding errors, as well as assisting duringcompilation of source code.

Another example of the use of data interfaces follows. A data interfacecan be declared in the same way a regular interface is declared, withthe following restrictions: the modifier Data must be come before theInterface keyword, the interface can only contain properties, and a datainterface cannot inherit from a regular interface, and vice versa. Notein this example, Data is not a reserved word. Additionally, propertiesin a data interface cannot have index parameters. The following are someexample data interfaces: Data Interface Point   Property X( ) As Integer  Property Y( ) As Integer End Interface Data Interface Customer  Property Name( ) As String   Property Phone( ) As String End InterfaceData Interface Employee   Inherits Customer   Property Address( ) AsAddress End Data Interface Data Interface Address   Property Street( )As String   Property City( ) As String   Property State( ) As String  Property ZIP( ) As Integer End Interface

Data interfaces, like regular interfaces, can have reference, ratherthan value, semantics. Assigning one data interface to another copies areference to the source data interface instead of copying the value ofthe source data interface into the destination data interface. Forexample, the following code does not modify the original object: ModuleTest   Sub Main( )     Dim t1 As Customer = GetCustomer(“Bob”)     Dimt2 As Customer = GetCustomer(“Alice”)     t1 = t2   End Sub End Module

To modify the original data interface, the individual fields can beassigned values: Module Test   Sub Main( )     Dim t1 As Customer =GetCustomer(“Bob”)     Dim t2 As Customer = GetCustomer(“Alice”)    With t1       .Name = t2.Name       .Phone = t2.Phone     End With  End Sub End Module

Data interfaces can be used anywhere a type name is allowed, with theexception that Declare statements cannot refer to data interfaces.InterfaceDeclaration ::=   [ Attributes ] [ TypeModifier+ ] [Data ] Interface Identifier [ TypeParameterList ]    StatementTerminator   [ InterfaceBase+ ]  [ InterfaceMemberDeclaration+ ]   End Interface StatementTerminator

Data interfaces can contain a special member called the value member.The value member can be represented by the character * and can representall of the elements in the data interface (the value of the datainterface) but not the data interface itself. The type of the valuemember is the data interface type, but the value member can only appearon the left hand side of the assignment statement and in the select listof a Select expression. The value member cannot be qualified.

The value member can be used in assignment statements to assign a set ofvalues to a data interface instead of changing its reference. When thevalue member is the target of an assignment, the value of the datainterface is modified rather than the reference to the data interface.For example: Module Test   Sub Main( )     Dim t1, t2 As Customer    t1.* = new Values {Name:=“Bob Smith”, Phone:=“(206) 555-1212”}     ‘Copies the value, instead of copying the reference     t2.* = t1     ‘Modifies only the original customer value     t1.Name = “John Smith”    ‘ Prints “Bob Smith” because t2 is a copy    Console.WriteLine(t2.Name)   End Sub End Module

Data containers that can have data interfaces imposed on them can bereferred to as tuples. A tuple can be an instance of a class that cansupport a data interface. A type can become a tuple type by implementingthe ITuple interface. When a program accesses a property in a datainterface, this access can be converted into a call to the ITupleinterface to retrieve the value from the type. For example, the code:  Module Test     Function GetPoint( ) As Point       . . .     EndFunction     Sub Main( )       Dim p As Point       p = GetPoint( )      Console.WriteLine(p.X & “,” & p.Y)     End Sub   End Module

The class Values can define a general data container that can also be atuple type. The Values type can be used to expose a set of values as adata interface. For example: Module Test   Sub PrintPoint(ByVal p AsPoint)     Console.WriteLine(p.X & “,” & p.Y)   End Sub   Sub Main( )    Dim p As Point = New Values { X := 10, Y := 20 }     PrintPoint(p)  End Sub End Module

Module Test Function GetPoint( ) As ITuple . . . End Function Sub Main() Dim p As ITuple p = GetPoint( ) Console.WriteLine(p.GetValue(OfInteger) (“X”) & “,” & _(—) p.GetValue(Of Integer) (“Y”)) End Sub EndModule

In general, conversions between data interfaces and non-data interfacescan be treated as if the data interface were instead ITuple. Datainterfaces can also define the following conversions. A wideningconversion from a data interface to the ITuple interface and a narrowingconversion from the ITuple interface to a data interface. For example:Module Test  Sub Main( )    Dim p As Point = GetPoint( )    Dim t AsITuple    t = p    Console.WriteLine(t!X)  End Sub End ModuleThere is a widening conversion between two equivalent data interfaces orbetween a data interface and an encompassing data interface. If this isnot the case, conversions between two data interfaces are narrowing.

Two data interfaces can be considered equivalent if every property inone data interface has a corresponding property in the other datainterface with the same name and data type. A data interface A can beconsidered to be encompassed by another data interface B if A isequivalent to B, considering only the properties in A. If data interfaceA is encompassed by data interface B, then data interface B isconsidered to be encompassing data interface A. In the followingexample, the FullCustomer data interface encompasses SmallCustomerbecause the overlapping elements of the two data interfaces areequivalent: Data Interface FullCustomer   Property Name( ) As String  Property Phone( ) As String   Property Address( ) As String EndInterface Data Interface SmallCustomer   Property Name( ) As String EndInterface Module Test   Sub Main( )     Dim x As FullCustomer =GetCustomer( )     Dim y As SmallCustomer     ‘ Widening conversion,FullCustomer encompasses SmallCustomer     y = x     ‘ Narrowingconversion     x = CType(y, FullCustomer)   End Sub End Module

It should be noted that as with regular interfaces converting a tupletype to a particular data interface or from one data interface type toanother does not provide any static compile-time guarantees that theconversion will succeed at run-time. If a tuple type is converted to adata interface but does not contain a particular data member on thatinterface, accessing that member can cause a run-time exception. Therecan be situations where it is possible to statically determine whether aconversion will succeed, for example, the result of a query without a *operator. Checking can be extended in such cases.

Data interfaces can be analogous to regular interfaces in the sense thata data interface can be implemented such that it lacks an intrinsicidentity. A tuple type can be considered to be its original type evenwhen converted to a data interface type. For example, if the Locationstructure implements the Point data interface, the following code willprint out Location, not Point: Module Test   Sub Main( )     Dim x AsLocation = GetLocation( )     Dim y As Point = x     ‘ Prints out“Location”     Console.WriteLine(y.GetType( ).ToString( ))   End Sub EndModule

Similarly, the Is operator can determine whether underlying instances ofa data interface are the same: Function AreTheSameTuple(ByVal p1 AsPoint, ByVal p2 As Point)   Return p1 Is p2 End Function

However, a value can be tested to see whether it is compatible with aparticular data interface using TypeOf . . . Is: Module Test   Sub Main()     Dim x As Location = GetLocation( )     If TypeOf x Is Point Then      Console.WriteLine(“Compatible”)     End If   End Sub End Module

Instead of implementing ITuple, a type can become a tuple type byimplementing a data interface: Data Interface Point   Property X( ) AsInteger   Property Y( ) As Integer End Interface Class Location  Implements Point   Public Property XLocation( ) As Integer ImplementsPoint.X     . . .   End Property   Public Property YLocation( ) AsInteger Implements Point.Y     . . .   End Property End Class ModuleTest   Sub Main( )     Dim s As New Location( )     Dim p As Point    s.XLocation = 10     s.YLocation = 20     p = s     p.X = 30     p.Y= 40   End Sub End Module

When a type implements a data interface, an automatic implementation ofITuple can be provided for the particular data interface mapping. Itshould be noted that a type can still choose to implement ITupledirectly if desired to provide a dynamic data interface. A type can berestricted to implement only one data interface (or ITuple).

A type that implements a data interface type can have a wideningconversion to the data interface type and a narrowing conversion fromthe data interface type. When the type is a value type, a conversion toor from a data interface type can copy a value in the type, as the valuetype must be boxed or unboxed when cast to or from ITuple. When the typeis a reference type, a conversion to or from a data interface type cancopy a reference to the tuple type.

Data interfaces cannot be directly emitted into assembly metadata.Instead, a data interface can be emitted into metadata as a regularinterface. The data interface:   Public Data Interface Point    Property X( ) As Integer     Property Y( ) As Integer   EndInterface

As previously disclosed and described, when a type implements a datainterface the type actually can implement ITuple instead of the datainterface. For example: Class MyCustomer   Implements Customer   . . .End Class

<DataInterface> _(—) Public Interface Point Property X( ) As IntegerProperty Y( ) As Integer End Interface

<DataInterfaceImplemented(“Customer”) > _(—) Class MyCustomer ImplementsITuple . . . End Class

References to a data interface can be emitted as references to theITuple with an optional custom modifier that can refers to the interfaceemitted for the data interface. This means that in some implementations,the method: Public Sub MoveTo(ByVal x As Point)   ... End Sub

can appear as: Public Sub MoveTo(ByVal x As ITuple)   ... End SubThus, from an external perspective, the data interface type can beerased in favor of the ITuple interface. Although the compiler will seedata interfaces, other components will only see ITuple. Anotherimplication of type erasure is that a GetType type expression on a datainterface type will return the System. Type object for ITuple, not thedata interface.

The ISchema interface can be used to inspect the schema of a tuple atruntime. It should be noted that this interface can be definedseparately from ITuple so that schema information can be providedseparately from a tuple instance. Public Interface ISchema   ReadOnlyProperty Name( ) As String   ReadOnly Property FieldCount( ) As Integer  Function GetDataTypeName(ByVal index As Integer) As String   FunctionGetFieldType(ByVal index As Integer) As System.Type   FunctionGetName(ByVal index As Integer) As String   Function GetOrdinal(ByValname As String) As Integer End Interface

The members of the ISchema interface can be defined as follows. ReadOnlyProperty Name( ) As String can return the name of the schema, if any. Itcan return Nothing if the schema has no name. ReadOnly PropertyFieldCount( ) As Integer can return the number of fields in the schema.Function GetDataTypeName(ByVal index As Integer) As String can returnthe name of the data type of the specified field. FunctionGetFieldType(ByVal index As Integer) As System.Type can return the datatype of the specified field. Function GetName(ByVal index As Integer) AsString can return the name of the specified field. FunctionGetIsReadOnly(ByVal index As Integer) As Boolean can return whether thespecified field is read-only. Function GetOrdinal(ByVal name As String)As Integer can return the index of the specified field name, −1otherwise.

The ITuple interface can define methods used to access the values of atuple. Public Interface ITuple   Inherits ISchema   Default PropertyItem(ByVal index As Integer) As Object   Default Property Item(ByValname As String) As Object Function GetBytes(ByVal i As Integer, ByValfieldOffset As Long, _(—)     ByVal buffer( ) As Byte, ByValbufferOffset As Integer, _(—)     ByVal length As Integer) As Long  Function GetChars(ByVal i As Integer, ByVal fieldOffset As Long, _(—)    ByVal buffer( ) As Char, ByVal bufferOffset As Integer, _(—)    ByVal length As Integer) As Long   Function GetValue(Of T) (ByVal iAs Integer) As T   Function GetValues(ByVal values( ) As Object) AsInteger   Sub SetBytes(ByVal i As Integer, ByVal fieldOffset As Long,_(—)     ByVal buffer( ) As Byte, ByVal bufferOffset As Integer, _(—)    ByVal length As Integer)   Sub SetChars(ByVal i As Integer, ByValfieldoffset As Long, _(—)     ByVal buffer( ) As Char, ByValbufferOffset As Integer, _(—)     ByVal length As Integer)   SubSetValue(Of T) (ByVal i As Integer, ByVal value As T)   SubSetValues(ByVal values( ) As Object)   Function GetIsDBNull(ByVal i AsInteger) As Boolean   Sub SetIsDBNull(ByVal i As Integer) End Interface

The members are defined as follows. Default ReadOnly Property Item(ByValindex As Integer) As Object can return the field corresponding to thespecified index. Default ReadOnly Property Item(ByVal name As String) AsObject can return the field corresponding to the specified field name.Function GetBytes(ByVal i As Integer, ByVal fieldOffset As Long, ByValbuffer( ) As Byte, ByVal bufferOffset As Integer, ByVal length AsInteger) As Long can retrieve the specified bytes from the field. It canalso return the number of bytes retrieved. Function GetChars(ByVal i AsInteger, ByVal fieldOffset As Long, ByVal buffer( ) As Char, ByValbufferOffset As Integer, ByVal length As Integer) As Long can retrievethe specified characters from the field. It can also return the numberof bytes retrieved.

Function GetValue(Of T) (ByVal i As Integer) As T can return the fieldcorresponding to the specified index typed as a specific type. FunctionGetValues(ByVal values( ) As Object) As Integer can retrieve the fieldsof the tuple into an array and the number of fields in the array. SubSetBytes(ByVal i As Integer, ByVal fieldOffset As Long, ByVal buffer( )As Byte, ByVal bufferOffset As Integer, ByVal length As Integer) can setthe specified bytes of the field.

Sub SetChars(ByVal i As Integer, ByVal fieldOffset As Long, ByValbuffer( ) As Char, ByVal bufferOffset As Integer, ByVal length AsInteger) can set the specified characters of the field. Sub SetValue(OfT) (ByVal i As Integer, ByVal value As Object) can set the fieldcorresponding to the specified index typed as a specific type. SubSetValues(ByVal values( ) As Object) can set the fields of the tuplefrom an array. Function GetIsDBNull(ByVal i As Integer) As Boolean canretrieve whether the field is null. Sub SetIsDBNull(ByVal i As Integer)can set the fields to null.

The class Values can define a general data container that is also atuple type. Public Class Values   Implements ITuple End Class

FIG. 2 is a system block diagram of a data interface system 200. Thedata interface system 200 can be used to provide a strongly typed viewof untyped data. Specifically, the data interface system 200 can be usedto supply types for data in a well-formed XML document through use of adata interface in conjunction with a user-defined interface.

The data interface system 200 includes a data interface 210. The datainterface 210 can be a generic interface that can be created by acomputer programmer or software engineer. Specifically, the datainterface 210 can be any of the data interfaces previously disclosed ordiscussed in conjunction with FIG. 1. The data interface 110 can includeone or more members 220. As with one of the examples previouslypresented, in an object-oriented implementation, a member 220 of thedata interface 210 can include a property, a method, or an object, amongother things. Additionally or alternatively, members such as the member220 can be restricted, such as only allowing properties as members ofthe data interface 210.

A user-defined interface 230 is also part of the data interface system200. The user-defined interface 230 can be created by a computerprogrammer or a software developer using a high-level programminglanguage. The user-defined interface 230 can be an interface that isimplemented by some data type as previously described.

The data interface 210 can be used to supply a static type for data tobe accessed. Specifically, the static type of the data interface 210 canbe used when the dynamic interface 210 is imposed over some untypeddatum. An implementation generation component 240 can use informationabout the data interface 210 and members 220 of the data interface 210,along with information about the user-defined interface 230, to stronglytype an underlying datum in a similar fashion to that previouslydescribed with fixed interfaces.

The implementation generation component 240 can be a compiler for ahigh-level programming language or other programming language, apreprocessor, a precompiler, or some other appropriate or suitablecomponent. Operation of the implementation generation component canresult in the creation of an implementation 250. The implementation 250can be a strongly-typed view of the originally untyped data.

FIG. 3 is a system block diagram of a data interface system 300. Thedata interface system 300 can be used to provide a strongly typed viewof untyped data. Specifically, the data interface system 300 can be usedto supply types for data in a well-formed XML document, or untypedobjects through use of two user-defined interfaces.

The data interface system 300 includes a first user-defined interface310 and a second user-defined interface 320. Each of the user-definedinterfaces 310, 320 can be created by a computer programmer or softwareengineer using a high-level programming language. Specifically, theuser-defined interfaces 310, 320 can be constructed in accordance withprinciples set out previously such that one of the user-definedinterfaces 310, 320 can be used to view data in terms of the otheruser-defined interface 310 or 320, as appropriate.

In this example, the user-defined interface 310 can be used to supply astatic type for data to be accessed. Specifically, the static type ofthe user-defined interface 310 can be used when the dynamic interface310 is imposed over some untyped datum. An implementation generationcomponent 330 can use information about the data interface 310, alongwith information about the user-defined interface 320, to strongly typean underlying datum in a similar fashion to that previously described.

The implementation generation component 330 can be a compiler for ahigh-level programming language or other programming language, apreprocessor, a precompiler, or some other appropriate or suitablecomponent. Operation of the implementation generation component canresult in the creation of an implementation 340. The implementation 340can be a strongly-typed view of the originally untyped data.

FIG. 4 is a system block diagram of a composable data interface system400. The composable data interface system 400 can be used to createstrongly-typed views of untyped data. Specifically, the composable datainterface system 400 can take a pair of inputs and produce an output totransform a data type.

The composable data interface system 400 includes a first input 410. Thefirst input 410 includes information regarding what output is to becreated. A constructed type C can be defined to accept inputs T, S, andR. This constructed type can implement a data interface I. A secondinput 420 includes information about data interface I. This second input420 can supply details regarding how data interface I is implemented.

A construction module 430 can use the first input 410 and the secondinput 420 to construct an implementation that results in a desired typecast. To do so, the construction module 430 can use a first sub-module440 that has a first input 450 and a second input 460 along with asecond sub-module 470 that has a first input 480 and a second input 490to create a mapping that results in the desired type cast. Inputs of thefirst sub-module 440 and the second sub-module 470 correspond to inputs410, 420 of the construction module 430. Specifically, inputs 450, 480of sub-modules 440, 470, respectively correspond to input 410 of theconstruction module 430. Similarly, inputs 460, 490 of sub-modules 440,470, respectively correspond to input 420 of the construction module430. Thus, the construction module 430 and sub-modules 440, 470 eachhave one “what” input and one “how” input.

Consultation arrows from sub-modules 440, 470 and construction module430 indicate that the respective components can communicate with otherappropriate components, such as a reflection interface, to create amapping. Such creation can be in accordance with techniques describedearlier in conjunction with other figures. It should be noted that inthis system, the composable data interface system 400 can itself be usedas a sub-module of another the composable data interface system toassist in the creation of a mapping.

FIG. 5 is a system block diagram of a software development system 500.The software development system can be used to create software thataccesses untyped data. Specifically, software created by the softwaredevelopment system 500 can use strongly typed views of untyped dataprovided by data interfaces.

The software development system 500 includes a text editor 510. The texteditor 510 can be any suitable text editor that can work with text thatcan be presented to another component for conversion intomachine-executable code. The text editor can be used to create sourcecode 520. The source code 520 can be human-readable text in a high levelprogramming language.

An artificial intelligence engine 530 can provide supplemental functionsfor the text editor 510 when the text editor 510 is used to createsource code 520. For example, the artificial intelligence engine 530 canprovide syntax highlighting, code completion suggestions, type castingsuggestions, or a host of various other functions. The artificialintelligence engine 530 can be implemented as a an expert system, aneural network, an SVM, or another suitable component.

A compiler 540 can access the source code 520 to translate the sourcecode 520 into machine-executable software. As part of the translationprocess, the compiler 540 can access a data interface system 550 to makeuse of data interfaces of the type previously disclosed and described inconjunction with other figures. Additionally, if desired in a specificimplementation, the artificial intelligence engine 530 can assist thecompiler in code optimization or other functions. Compiled code 560 caninclude code that uses a strongly typed view of untyped data as part ofits function.

With reference to FIGS. 6-11, flowcharts in accordance with variousmethods or procedures are presented. While, for purposes of simplicityof explanation, the one or more methodologies shown herein, for example,in the form of a flow chart, are shown and described as a series ofacts, it is to be understood and appreciated that neither theillustrated and described methods and procedures nor any components withwhich such methods or procedures can be used are necessarily limited bythe order of acts, as some acts may occur in a different order and/orconcurrently with other acts from that shown and described herein. Forexample, those skilled in the art will understand and appreciate that amethodology could alternatively be represented as a series ofinterrelated states or events, such as in a state diagram. Moreover, notall illustrated acts may be required to implement a methodology orprocedure.

FIG. 6 is a flow diagram of a method 600 that can be employed inconjunction with systems and components disclosed or described herein.The flow diagram depicts a method 600 of creating a data interface. Thedata interface can be used to manage data for use in software much aspreviously disclosed and described in conjunction with other figures.Specifically, the data interface can be used to provide a strongly typedview of untyped data in the manners discussed herein.

Processing of the method 600 begins at START block 610 and continues toprocess block 620. At process block 620, a data interface type iscreated. Processing continues to process block 630 where a member of thenewly-created data interface is created. Details of this member aredefined in accordance with any constraints applicable for a specificimplementation at process block 640.

The method 600 continues processing at decision block 650. At decisionblock 650, a determination is made whether more members of the datainterface remain to be defined. If this determination is yes, processingreturns to process block 640. If the determination made at decisionblock 650 is no, processing concludes at END block 660.

FIG. 7 is a flow diagram of a method 700 that can be employed inconjunction with systems and components disclosed or described herein.The flow diagram depicts a method 700 of using a data interface.Specifically, the data interface can be used for providing a stronglytyped view of untyped data in the manners discussed herein.

Processing of the method 700 begins at START block 710 and continues toprocess block 720. At process block 720, a data interface, such as anyof the data interfaces previously disclosed and described herein, iscreated. Processing continues to process block 730 where an instance ofthe newly-created data interface is created. This instance object has adynamic type. At process block 740, a value is assigned to thisinstance.

The method 700 continues processing at process block 750. At processblock 750, an instance of some type T is created. Processing of themethod 700 continues at process block 760 where a value is assigned tothe type T in accordance with the data interface. Processing concludesat END block 760.

FIG. 8 is a flow diagram of a method 800 that can be employed inconjunction with systems and components disclosed or described herein.The flow diagram depicts a method 800 of using a data interface.Specifically, the data interface can be used for providing a stronglytyped view of untyped data in the manners discussed herein.

Processing of the method 800 begins at START block 810 and continues toprocess block 820. At process block 820, a data interface, such as anyof the data interfaces previously disclosed and described herein, iscreated. Processing continues to process block 830 where a typed objectis created. At process block 840, a value is assigned to this typedobject using the data interface.

The method 800 continues processing at process block 850. At processblock 850, compilation of software code begins. At process block 860,definitions provided by the data interface are used by a compiler totypecast to a static type. At process block 870, a static type of thedata interface is erased. Processing concludes at END block 880.

FIG. 9 is a flow diagram of a method 900 that can be employed inconjunction with systems and components disclosed or described herein.The flow diagram depicts a method 900 of using a data interface.Specifically, the data interface can be imposed on a group of types toprovide a strongly typed view.

Processing of the method 900 begins at START block 910 and continues toprocess block 920. At process block 920, a generic data interface, suchas any of the data interfaces previously disclosed and described herein,is created. Processing continues to process block 930 where types thateach implement a common fixed interface are added to the generic datainterface. At process block 940, conversions from the generic datainterface to the fixed interface implemented by each of the added typesare defined. At process block 950, each of the defined conversions isset as a default implementation. Processing concludes at END block 960.

FIG. 10 is a flow diagram of a method 1000 that can be employed inconjunction with systems and components disclosed or described herein.The flow diagram depicts a method 1000 of using a data interface.Specifically, the data interface can be used for providing a stronglytyped view of untyped data in the manners discussed herein.

Processing of the method 1000 begins at START block 1010 and continuesto process block 1020. At process block 1020, a reflection interface isused to obtain a member with a name specified by a signature. Processingcontinues to process block 1030 where a return type is used to cast aresult of the reflection operation. At process block 1040, a specifiedinterface is used to obtain a member with a specified name.

The method 1000 continues processing at process block 1050. At processblock 1050, the specified type is used to typecast. Processing concludesat END block 1060.

FIG. 11 is a flow diagram of a method 1100 that can be employed inconjunction with systems and components disclosed or described herein.The flow diagram depicts a method 1100 of using a data interface.Specifically, the data interface can be used for providing a stronglytyped view of untyped data in the manners discussed herein.

Processing of the method 1100 begins at START block 1110 and continuesto process block 1120. At process block 1120, an interface that a firsttype T1 implements is specified. Processing continues to process block1130 where an implementation of members is created. At process block1140, a data interface implementation component is supplied to thecompiler. Processing continues to process block 1150 where known defaultimplementations of members are supplied.

The method 1100 continues processing at decision block 1160. At decisionblock 1160, determination is made whether a supplied interface providessufficient information for a compiler to perform a desired conversion ortypecast. If the determination made at decision block 1160 is no, anerror message is created at process block 1170. If the determinationmade is yes, at process block 1180 the subject code is compiled.Processing of the method 1100 from either process block 1170 or processblock 1180 concludes at END block 1190.

In order to provide additional context for implementation, FIGS. 12-13and the following discussion is intended to provide a brief, generaldescription of a suitable computing environment within which disclosedand described components and methods can be implemented. While variousspecific implementations have been described above in the generalcontext of computer-executable instructions of a computer program thatruns on a local computer and/or remote computer, those skilled in theart will recognize that other implementations are also possible eitheralone or in combination with other program modules. Generally, programmodules include routines, programs, components, data structures, etc.that perform particular tasks and/or implement particular abstract datatypes.

Moreover, those skilled in the art will appreciate that theabove-described components and methods may be practiced with othercomputer system configurations, including single-processor ormulti-processor computer systems, minicomputers, mainframe computers, aswell as personal computers, hand-held computing devices,microprocessor-based and/or programmable consumer electronics, and thelike, each of which may operatively communicate with one or moreassociated devices. Certain illustrated aspects of the disclosed anddescribed components and methods may also be practiced in distributedcomputing environments where certain tasks are performed by remoteprocessing devices that are linked through a communications network orother data connection. However, some, if not all, of these aspects maybe practiced on stand-alone computers. In a distributed computingenvironment, program modules may be located in local and/or remotememory storage devices.

With reference to FIG. 12, an exemplary environment 1200 forimplementing various aspects of the invention includes a computer 1212.The computer 1212 includes a processing unit 1214, a system memory 1216,and a system bus 1218. The system bus 1218 couples system componentsincluding, but not limited to, the system memory 1216 to the processingunit 1214. The processing unit 1214 can be any of various availableprocessors. Dual microprocessors and other multiprocessor architecturesalso can be employed as the processing unit 1214.

The system bus 1218 can be any of several types of bus structure(s)including the memory bus or memory controller, a peripheral bus orexternal bus, and/or a local bus using any variety of available busarchitectures including, but not limited to, Industrial StandardArchitecture (ISA), Micro-Channel Architecture (MSA), Extended ISA(EISA), Intelligent Drive Electronics (IDE), VESA Local Bus (VLB),Peripheral Component Interconnect (PCI), Card Bus, Universal Serial Bus(USB), Advanced Graphics Port (AGP), Personal Computer Memory CardInternational Association bus (PCMCIA), Firewire (IEEE 1394), and SmallComputer Systems Interface (SCSI).

The system memory 1216 includes volatile memory 1220 and nonvolatilememory 1222. The basic input/output system (BIOS), containing the basicroutines to transfer information between elements within the computer1212, such as during start-up, is stored in nonvolatile memory 1222. Byway of illustration, and not limitation, nonvolatile memory 1222 caninclude read only memory (ROM), programmable ROM (PROM), electricallyprogrammable ROM (EPROM), electrically erasable ROM (EEPROM), or flashmemory. Volatile memory 1220 includes random access memory (RAM), whichacts as external cache memory. By way of illustration and notlimitation, RAM is available in many forms such as synchronous RAM(SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rateSDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), anddirect Rambus RAM (DRRAM).

Computer 1212 also includes removable/non-removable,volatile/non-volatile computer storage media. For example, FIG. 12illustrates a disk storage 1224. The disk storage 1224 includes, but isnot limited to, devices like a magnetic disk drive, floppy disk drive,tape drive, Jaz drive, Zip drive, LS-100 drive, flash memory card, ormemory stick. In addition, disk storage 1224 can include storage mediaseparately or in combination with other storage media including, but notlimited to, an optical disk drive such as a compact disk ROM device(CD-ROM), CD recordable drive (CD-R Drive), CD rewritable drive (CD-RWDrive) or a digital versatile disk ROM drive (DVD-ROM). To facilitateconnection of the disk storage devices 1224 to the system bus 1218, aremovable or non-removable interface is typically used such as interface1226.

It is to be appreciated that FIG. 12 describes software that acts as anintermediary between users and the basic computer resources described inthe suitable operating environment 1200. Such software includes anoperating system 1228. The operating system 1228, which can be stored onthe disk storage 1224, acts to control and allocate resources of thecomputer system 1212. System applications 1230 take advantage of themanagement of resources by operating system 1228 through program modules1232 and program data 1234 stored either in system memory 1216 or ondisk storage 1224. It is to be appreciated that the subject inventioncan be implemented with various operating systems or combinations ofoperating systems.

A user enters commands or information into the computer 1212 throughinput device(s) 1236. The input devices 1236 include, but are notlimited to, a pointing device such as a mouse, trackball, stylus, touchpad, keyboard, microphone, joystick, game pad, satellite dish, scanner,TV tuner card, digital camera, digital video camera, web camera, and thelike. These and other input devices connect to the processing unit 1214through the system bus 1218 via interface port(s) 1238. Interfaceport(s) 1238 include, for example, a serial port, a parallel port, agame port, and a universal serial bus (USB). Output device(s) 1240 usesome of the same type of ports as input device(s) 1236. Thus, forexample, a USB port may be used to provide input to computer 1212, andto output information from computer 1212 to an output device 1240.Output adapter 1242 is provided to illustrate that there are some outputdevices 1240 like monitors, speakers, and printers, among other outputdevices 1240, which require special adapters. The output adapters 1242include, by way of illustration and not limitation, video and soundcards that provide a means of connection between the output device 1240and the system bus 1218. It should be noted that other devices and/orsystems of devices provide both input and output capabilities such asremote computer(s) 1244.

Computer 1212 can operate in a networked environment using logicalconnections to one or more remote computers, such as remote computer(s)1244. The remote computer(s) 1244 can be a personal computer, a server,a router, a network PC, a workstation, a microprocessor based appliance,a peer device or other common network node and the like, and typicallyincludes many or all of the elements described relative to computer1212. For purposes of brevity, only a memory storage device 1246 isillustrated with remote computer(s) 1244. Remote computer(s) 1244 islogically connected to computer 1212 through a network interface 1248and then physically connected via communication connection 1250. Networkinterface 1248 encompasses wire and/or wireless communication networkssuch as local-area networks (LAN) and wide-area networks (WAN). LANtechnologies include Fiber Distributed Data Interface (FDDI), CopperDistributed Data Interface (CDDI), Ethernet, Token Ring and the like.WAN technologies include, but are not limited to, point-to-point links,circuit switching networks like Integrated Services Digital Networks(ISDN) and variations thereon, packet switching networks, and DigitalSubscriber Lines (DSL).

Communication connection(s) 1250 refers to the hardware/softwareemployed to connect the network interface 1248 to the bus 1218. Whilecommunication connection 1250 is shown for illustrative clarity insidecomputer 1212, it can also be external to computer 1212. Thehardware/software necessary for connection to the network interface 1248includes, for exemplary purposes only, internal and externaltechnologies such as, modems including regular telephone grade modems,cable modems and DSL modems, ISDN adapters, and Ethernet cards.

FIG. 13 is a schematic block diagram of a sample-computing environment1300 within which the disclosed and described components and methods canbe used. The system 1300 includes one or more client(s) 1310. Theclient(s) 1310 can be hardware and/or software (for example, threads,processes, computing devices). The system 1300 also includes one or moreserver(s) 1320. The server(s) 1320 can be hardware and/or software (forexample, threads, processes, computing devices). The server(s) 1320 canhouse threads or processes to perform transformations by employing thedisclosed and described components or methods, for example.

One possible means of communication between a client 1310 and a server1320 can be in the form of a data packet adapted to be transmittedbetween two or more computer processes. The system 1300 includes acommunication framework 1340 that can be employed to facilitatecommunications between the client(s) 1310 and the server(s) 1320. Theclient(s) 1310 are operably connected to one or more client datastore(s) 1350 that can be employed to store information local to theclient(s) 1310. Similarly, the server(s) 1320 are operably connected toone or more server data store(s) 1330 that can be employed to storeinformation local to the server(s) 1340.

What has been described above includes examples of the subjectinvention. It is, of course, not possible to describe every conceivablecombination of components or methodologies for purposes of describingthe subject invention, but one of ordinary skill in the art mayrecognize that many further combinations and permutations of the subjectinvention are possible. Accordingly, the subject invention is intendedto embrace all such alterations, modifications, and variations that fallwithin the spirit and scope of the appended claims.

In particular and in regard to the various functions performed by theabove described components, devices, circuits, systems and the like, theterms (including a reference to a “means”) used to describe suchcomponents are intended to correspond, unless otherwise indicated, toany component which performs the specified function of the describedcomponent (e.g., a functional equivalent), even though not structurallyequivalent to the disclosed structure, which performs the function inthe herein illustrated exemplary aspects of the invention. In thisregard, it will also be recognized that the invention includes a systemas well as a computer-readable medium having computer-executableinstructions for performing the acts and/or events of the variousmethods of the invention.

In addition, while a particular feature of the invention may have beendisclosed with respect to only one of several implementations, suchfeature may be combined with one or more other features of the otherimplementations as may be desired and advantageous for any given orparticular application. Furthermore, to the extent that the terms“includes,” and “including” and variants thereof are used in either thedetailed description or the claims, these terms are intended to beinclusive in a manner similar to the term “comprising.”

1. A computer-implemented system for accessing data stored in acomputer-readable format, comprising: a data source indicator thatidentifies least one datum of a data source to be typed; and a typedefinition component that defines a strongly typed view of the at leastone datum.
 2. The system of claim 1, wherein the at least one datum isuntyped.
 3. The computer-implemented system of claim 2, furthercomprising a wrapper module that includes the data source indicator andthe type definition component to couple the data source indicator withthe type definition module.
 4. The computer-implemented system of claim3, further comprising a type conversion module that uses the wrappermodule to strongly type the at least one untyped datum.
 5. Thecomputer-implemented system of claim 4, wherein the wrapper moduleprovides a default implementation to strongly type the at least oneuntyped datum.
 6. The computer-implemented system of claim 4, whereinthe wrapper module provides a user-supplied implementation to stronglytype the at least one untyped datum.
 7. The computer-implemented systemof claim 5, wherein the wrapper module is compositional.
 8. Thecomputer-implemented system of claim 6, wherein the wrapper module iscompositional.
 9. A computer-executable method for providing astrongly-typed view of an untyped datum, comprising: creating a firstinterface component that obtains an untyped datum from an underlyingdata source; and creating a second interface component that accesses thefirst template component to assign a predefined type to the untypeddatum.
 10. The computer-executable method of claim 9, wherein creating asecond interface component includes creating a member of the secondtemplate component that defines a cast of a datum to a desired type. 11.The computer-executable method of claim 10, further comprising using thesecond interface component to strongly type the untyped datum.
 12. Thecomputer-executable method of claim 11, wherein using the secondinterface component to strongly type the untyped datum includescompiling source code that refers to the untyped datum.
 13. Thecomputer-executable method of claim 12, wherein compiling source codeincludes erasing a type associated with the second interface component.14. The computer-executable method of claim 9, wherein creating a secondinterface component includes at least one of supplying a defaultimplementation for strongly typing the untyped datum and supplying auser-created implementation for strongly typing the untyped datum.
 15. Acomputer-implemented system for providing a strongly-typed view of anuntyped datum, comprising: creating a first interface component thatobtains an untyped datum from an underlying data source; and creating asecond interface component that accesses the first template component toassign a predefined type to the untyped datum.
 16. Thecomputer-implemented system of claim 15, wherein creating a secondtemplate component includes creating a member of the second interfacecomponent that defines a cast of a datum to a desired type.
 17. Thecomputer-implemented system of claim 16, further comprising using thesecond interface component to strongly type the untyped datum.
 18. Thecomputer-implemented system of claim 17, wherein using the secondinterface component to strongly type the untyped datum includescompiling source code that refers to the untyped datum.
 19. Thecomputer-implemented system of claim 18, wherein compiling source codeincludes erasing a type associated with the second interface component.20. The computer-implemented system of claim 15, wherein creating asecond interface component includes at least one of supplying a defaultimplementation for strongly typing the untyped datum and supplying auser-created implementation for strongly typing the untyped datum.